"The men were wearing black or dark colored shirts, had black backpacks, carried anarchist flags and acted differently than the other people in attendance," according to the FBI affidavit. They were soon joined by three other men and "appeared to be together and was constantly moving throughout the crowd expressing displeasure at the crowd's unwillingness to act violently."

When an organizer of the protest said they wanted to act peacefully, one of the men said "fuck that" and the whole group walked away, according to the FBI.